Attachment for machine tools and the like



Sept. 30, 1941. J. Y. BLAZEK EI'AL ATTACHMENT FOR MACHINE TOOLS AND THE LIKE Fil ed June 15, 1939 2 Sheets-Sheet 1 INVENTORS.

JoH/v Y BLAZEK VERNON R. RoY

Sept. 30, 1941- J. Y. BLAZEK ETAL 2257,493

ATTACHMENT FOR MACHINE TOOLS AND THE LIKE Filed June 15, 1939 25heets-Sheet 2 INVENTORS. Fl gn JO'HNXBLAZEK BY fizz/ i??? ATTORNE Patented'Sept. 30, 1941 ice a'rncnmzsrroa MACHINE rooLs AND rna LIKE John Y. Blazek, Bedford, and Vernon R. Roy, Cleveland, Ohio, assignors'to L'empco Products, Incorporated, Bedl'ord, Ohio, a corporation of q Ohio ApplicationJnne 15, 1939, Serial No. 279,284

19 Claims.

This invention relates, as indicated, to attachments for machine tools and the like, but has reference more particularly to a turret attachment for brake drum lathes.

In the conventional types of brake drum lathes for the truing and refinishing of brake drums, the brake drum, and the tire, in cases where the tire is left attached to the drum, are fairly-close to the endof the lathe. Moreover, the upper portion of the lathe extends upwardly to a point considerably above the level of the spindle of the lathe. This renders it difficult or impossible to use the conventional type of turret having cutting and grinding tools mounted thereon.

Another disadvantage inherent in conventional types of cutting and grinding equipment for brake drums is the diiiiculty of resetting the cutting and grinding tools for each brake'drum in a set, as well as the necessity of frequently and extensively redressing the grinding tool. a

A primary object of the invention is the provision of a cutting and grinding attachment for brake drum lathes which can be easily and quickly operated in a restricted space, and without danger of striking the tire, brake drum or brake drum lathe.

Another object of the invention is the provision of an attachment of the character described in which the cutting and grinding tools are so locked with respect to each other that they cannot be accidently or inadvertently moved.

A further object of the invention is to provide an attachment of the character described, in which the tools may be easily and accurately restored to operative positions for the cutting and grinding operations on each of a set of brak drums which is to be trued.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this specification, and in which like numerals are employed to designate like parts throughout thesame:

Fig. 1 is a fragmentary front elevation of a brake drum lathe, with the turret attachment of the present invention thereon;

Fig. 2 is a cross-sectional view taken on the line 22 of Fig. 1; a 4

Fig. 3 is a view of the turret attachment, as viewed from the right of Fig. 1:

Fig. 4 is a cross-sectional view, taken on the line 4-4 of Fig. 3;

Fig. 5 is a top plan view of the turret attachment, with the cutting tool in operative position;

Fig. 6 is a view similar to Fig. 5, but with the grinding tool in operative position;

Fig. 7 is a fragmentary cross-sectional view, showing the pin for locking the cutting tool block to the base plate of the turret attachment;

Fig. 8 is a perspective view of a spacer which is used in connection with the attachment, and

Fig. 9 is a perspective view of the base plate of the attachment.

Referring more particularly to-the drawings, reference character "I denotes a portion of a brake drum lathe, in the upper portion ll of which is disposed a spindle l2 which is adapted to be continuously rotated by means of suitable mechanism (not shown) which is attached to the lathe. The spindle 12 has mounted thereon the brake drum l3, which is thereby adapted to be rotated for the purpose of being machined and/or ground, as is customary in the refinishing or truing of such drums.

The brake drum may be refinished while on the tire H, as illustratedin Fig. l, or after being removed from the tire, as illustrated in Fig. 2.

The brake drum lathe II has formed on the front thereof a dove-tail projection I6 providing a pair of vertically-spaced slideways 16 for a carriage H which is slidable longitudinally of the I lathe, the carriage beingpropelledin either, direction by means of a motor-driven screw l6, which is controlled by a lever I6. The carriage may be propelled manually, as by means of a hand wheel 26.

Mounted on the carriage I1 is a cross-slide 2|, which is adapted to be moved inwardly and outwardly as by means of a crank lever 22 and screw 23. The cross-slide 2| has an aperture therein into which the head 2l of a vertically extending post 25 is press-fitted.

Mounted on the cross-slide 2| is a base plate 26, having a circular opening 21 therein through which the post 25 extends, the base plate having a limited pivotal movement in a horizontal plane about the post 25. The base plate 26 has formed thereon an arcuate slot 26, the center of which is the axis of the post 26, and through which a set screw 29 extends, and by means of which the plate 26 may be locked to the cross-slide in any desired position within its range of pivotal movement. The base plate 26 is further provided with a plurality of similar conical openings 30, 3|, 32 and 33, which are spaced circumferentlally about the opening 21, and the function of which will be presently described.

Mounted on the base plate 26. is a tool block 34 having an opening therein through which the post II extends, the tool block being rotatable about the post, except when locked to the base plate. The tool block 34 is provided with a dovetail extension 3! having slideways 36 disposed in planes parallel with the axisot the post II.

For the purpose of locking the tool block as in any of its adjusted positions, a pair of looking pins 81 is provided, having knurled heads II and tapered ends II, which are adapted to enter the conical openings ll to a inclusive of the base plate; The pins extend through counterbored openings 4. in the tool block, and

' are maintained in looking position by means of compression springs II which encircle thepins andbear at one end against a shoulder 42 and at the other end against a washer l3 sup-' ported by a pin 44 which projects from the locking pin.

The tool block ll is further provided with I detents ll, each of which, when the locking pin vated suiliciently to enable the head 3|: of the ,pin to clear thedetent I, after which the pin is rotated so as to cause the detent to engage the lower surface of the head 38 of the pin,

thereby maintaining the pin in'its released position.

Extending transversely of the tool block 34 through an opening 41 therein, is a tool holder 48, in one end of which is removably secured a cutting tool 49. The holder is adjustable with respect to the tool block, and is maintained in adjusted position by means of set screws 50.

Mounted on the tool block 34 for rotatable movement about the post is a slide member 5| having a dove tail extension 52 providing slideways 53, which, at times, are adapted to be aligned with the slideways 3B. of the tool block 84. A rack 54 is secured to the extension 52, and serves a purpose to be presently described.

The member ii is further provided at its lower end with an annular extension 65 which extends into a recess 58 in the tool block 34, thereby rigidifying the entire structure.

In order to lock the tool block 34, slide member ii and base plate 26 in any desired position relative to each other and to the: crossslide 2|, a spacer 1 and nut Bl are provided.

Mounted for verti'gal sliding movement on the slideways 53 of the slide member 5! is a grinder block 58 having a transversely extending opening ill through which a quill 6| extends, the quill being adjustable relatively to the block I9 and adapted to be locked in adjusted position by means of set screws 62. A spindle 63 is journalled in the quill Cl, and has mounted on one end thereof a grinding wheel N, the spindle being rotated as by means of a motor 65 and an endless belt 06. In order to suitably tension the belt 66 for grinding purposes, the motor 65 is mounted on a bracket 01, which is pivotally adjustable relatively to the block 59. The bracket 61 is provided with depending spaced ears 68 and 89, through which the bolt II, which secured the bracket to the block it extends, a spacer member 'll being interposed between the block 59 and the ear 6|. By removing the spacer member II from the position shown in Fig.3,

and inserting it between the block I! and the ear 69, the bracket and quill may be reset, so

as to permit use-of the grinding wheel in connection with work on deeper brake drums.

The block is further provided with a pinion 12 which is in mesh with the rack I4, the pinion being keyed to a shaft II having a he: end ll for engagement by a wrench or the like. By turning the shaft", the block Bl may be moved up or down to any desired position. For

the purpose of rigidly maintaining the block I! in its vertically adJusted position, a set screw 15 is provided which extends through the block 58 and bears against a gib it, which, in turn bears against one of the slideways ll of the member 5|.

Operation In order to best describe the operation of the device, it will be assumed that a set of four brake drums is to be trued and refinished. In order to best accomplish this, it is desirable that for each successive brake drum in the set, that the cutting tool as well asthe grinding tool be reset to its original operative position. To

facilitate such resetting of the cutting and grinding tools, the lock pins 31 and the openings 30 to 33 inclusive are provided. 1

Assuming that the set screw 29 is released and that the nut 58 is loosened so that the base plate 26, tool block 34 and slide member Ii are free to rotate with respect to each other, the

tool block 34 is first set in such a manner as to bring the cuttingtool 49 into proper cutting cannot simultaneously enter openings in the base plate. This provides a desired number of positions of adjustment for the tool block. With the tool block thus locked to the base plate, the base plate is then locked to the cross-slide by tightening the set screw 29, and the nut 5! is tightened so as to lock the tool block to the cross-slide.

The cutting operations on one brake drum are then conducted, it being understood that during these cutting operations, the grind wheel N is in the inoperative position shown in Figs. 1, 3 and 5.

After the cutting operations on one brake drum are completed, the nut 58 is loosened and the locking pin 3'! which is in engagement with the base plate is released thereby permitting the tool block 34 and theholder 48 carried thereby to be rotated about the post 25 to the inoperative position shown in dotted lines in Fig. 2, and in solid lines in Fig. 6.

The grinder block 59, together with the slide member II upon which the grinder block is mounted are then rotated in a counter-clockwise direction, as viewed in Fig. 5, until the slideways of the slide member II are aligned with the slideways of the tool block ll. A wrench is then applied to the end ll of the shaft 18, and is actuated to lower the grinder-block II, the block being lowered into engagement with the base plate 28, the grinder bloc]: engaging the dove-tail extension 35 of the tooltblock during its descent. In order to facilitate engagement of the grinder block with such dove-tail extension of the tool block, the upper ends of the dove-tail extension as well as the upper end portions of the tool blockadiacent such extension are curved or beveled as indicated by reference numeral 11, these curved or beveled por tions'acting to cam the grinder block into such engagement.

The tool block 34 and slide member ii are 'then shifted suiliciently to bring the axis oi the grinding wheel 64 in parallelism with the brake drum surface which has previously been machined. With the parts thus shifted, it is desirable that they be locked in such shifted position. Since the parts cannot be locked until one of the pins 81 engages one of the openings II to II inclusive in the base plate, it may be necessary to slightly shift the parts from such desired position until such an engagement can be secured. Thenut 58 is then tightened and the. set screw I tightened to lock the grinder block to the slide member 5|, and to the tool block 34.

Since the .grindingwheel, due to the aforesaid adjustment, hasbeen moved from its desired position of parallelism with the brake drum surface, it is necessary to dress the surface of the grinding wheel sufficiently to make it parallel with such brake drum surface. Since, however, the movement of the grinding wheel has been reduced as far as is practicable, a minimum amount of dressing will be required. For the grinding operationsthe various parts of the attachment will be in the position shown in Fig. 6.

Following the grinding operation, the brake drum is removed and replaced by the second brake drum of the set. The nut 58 is then loosened. as well as the set screw I5, and the grinder block is elevated and rotated to its inoperative position as shown in Fig. 5. The tool block 3| is then returned to its initial operative position,

and the pin 31, which was in locking engagement with the base plate during the cutting operation on the first brake drum, is caused to drop into the same opening in the base plate which it occupied during such first cutting operation. This insures that the cutting tool will have the same setting for each of the brake drums. Similarly by using the same locking pin and opening in the base plate that were used for the grinding operation, the grinding wheel will have the same setting for the grinding operation on all of the brake drums in the set.

It will be noted that the tire ll and brake drum I: are fairly close to the end of the lathe and that the upper portion ll oi. the brake drum lathe extends upwardly to a point considerably above the level of the spindle l2. By the use of the attachment which has been described, the various parts can be moved to their operative and inoperative positions without danger of striking the tire or brake drum or the portion l I of the brake drum lathe. This is true irrespective of the size and weight of the grinding and cutting tools which are normally used for the truing ofbrake drums.

It will also be noted that when the cutting or 1 grinding tool is in its operative position, the other tool is so locked with respect to the first tool that it cannot be accidently or inadvertently moved from its inoperative position.

Other advantages which may be noted are the ease and accuracy with which the tools may be restored to operative position for the cutting and grinding operations on each of a set oi. brake drums which is to be trued, as well as the rigidentire structure.

Although the invention has been described particularly with reference to brake drum lathes,

and to the truing of brake drums, it will be understood that it may, witbbut slight modiflcations, such as the use of diflerent tools, he used on other types of lathes and machines, and for slideways. and another element having a dovetail slideway adapted to engage said slideways whereby all of said elements are locked together.

2. In a device of the character described, a tool block, a slide member mounted on said block, said block and member being rotatable about a common axis, and a grinder block mounted on said slide member and movable in a direction parallel with said axis.

3. In a device of the character described, a

plurality of elements having similar slideways,

and another element having means thereon adapted to successively engage said slideways,

and means for facilitating the movement of said last-named element past the joints of said extensions, said means comprising beveled or curved ends on said slideways.

4. In a device of the character described, a too block, a spindle iournalled therein, a bracket,

said block and said bracket each having a hole therethrough, a pivot pin adapted to extend in each of said holes, a spacer member interposed between said holes and supported by said pin and a motor supported by said bracket for rotating said spindle.

5. Incombination with a lathe, a base member supported thereby, a tool supporting member supported by said base member, said members being rotatable about a common axis with respect to said lathe, one of said members having a plu-' rality of openings therein spaced circumferentially about said axis, a pin carried by the other of said members and adapted to selectively enter any of said openings for locking said members against rotation relatively to each other, said base member having an arcuate slot the center of which is on said axis, means projecting through said slot for locking said base member to said lathe, and a second tool supporting member rotatably carried by said base member.

6. In combination with a lathe, a base member supported thereby, a tool supporting member supported by said base member, said members being rotatable about a common axis with respect to said lathe, one of said members having a plurality of openings therein spaced circumferentialiy about said axis, a pin carried by the other carried by said first-named tool supporting memity. simplicity and economical character of the her and means for locking said tool supporting members against rotation relatively to each other.

7. A device of the character described comprising a tool supporting element, an. element rotatable relatively thereto, said elements having similar slideways, and another element having a slideway adapted to engage said first-named slideways whereby all of said elements are locked together...

8. In a device of the character described, a plurality of elements rotatable relatively to. each otherand having similar slideways, another element having a slideway adapted for engaging said first-named slideways for locking said lastnamed element to first-named elements, and means for moving said last-named element into locking position. 3

9. In a device of the character described, a base, a tool block rotatable with respect to said base, a slide member rotatable with respect to said base, said block and said member being rotatable about a common axis, and a grinder block 1 'slidably carried by said member.

10. combination with a lathe, abase member supported thereby, a tool supporting mem 'ber supported by said base member, said members being independently rotatable about a common axis with respect to said lathe, means adapted for locking said members against rotation with respect to each other in any of a plurality of predetermined degrees of rotation with respect to each other, means for locking said base member to said lathe and a second tool supporting member rotatably supported by said tool supporting member.

11. The combination of a pair of tool blocks each rotatable about a common axis relatively to the other, means for actuating one of said tool blocks alongsaid axis away fromand toward the other of said tool block and means responsive to actuating said one of said tool blocks towards said other of said tool blocks for locking said like comprising a post. a tool block rotatable about said post, a second tool block rotatable about said post, said blocks having cooperating guide faces. and means for moving one of said blocks parallel with said post when the said blocks have been rotated to bring the said faces into alignment to cause engagement of said guide faces for locking said'blocks together.-

15. An attachment for a machine tool and the like comprising a post, a tool block rotatable about said post, a second tool block rotatable about said post, said blocks having cooperating guide faces, and means carried by the movable tool block for moving the same parallel with said post when the blocks are in a predetermined position to cause engagement of said guide faces.

16. A machine having a horizontal-work-supporting spindle in combination with a pair of tool blocks each provided with a surface formation adapted to engage the other for locking said tool 'blocks together; each of said tool blocks being rotatable about a vertical axis, said tool blocks being relatively movabletoward and from each other whereby said surface formations engage and disengage each other.

v 1'7. In combination with a lathe, a base member ihovably supported thereby, a tool supporting member supported by said base member, said members being rotatable about a common axis with respect, to said lathe, means for locking said members against rotation relatively toeach other when they are in a predetermined degree of relative rotation, means for locking said base memher to said lathe in any of a plurality of positool blocks against rotation relatively to each other.

12. The combination of a pair of tool blocks each rotatable about a common axis relatively to the other and each provided with a surface formation, said surface formations being adapted for engaging each other for locking said tool blocks against rotation relative to each other, and means for rectilinearly moving said tool blocks relatively to each other whereby said surface formations may engage each other.

. 13. An attachment ,for a machine tool and the like comprising a post, a tool block rotatable about said post, a second tool block rotatable about said post, said blocks having cooperating guide faces, and means for moving one of said blocks parallel with said post when the blocks are in a' predetermined position to cause engagement of said guide faces.

14. An attachment for a machine tool :and the tions, and a second tool supporting member rotatably carried by said base member.

18. A device of the character described comprisinga post. a lower tool block on said post, an upper tool block slidable on said post, a spindle slidable through said upper tool block, and a motor carried by said upper tool block for driving said spindle, said motor being adjustable laterally of said block to correspond to adjustments of said spindle. v v

19. A device. of the character described comprising a post, 'a lower tool block on said post, an upper tool supporting member slidable on said post, a spindle slidable through said upper tool supporting member, a motor supporting member on said upper tool supporting member for driving said spindle, one of said members having a pair of spaced aligned apertures and the other of said members freely occupying the space between said spaced aligned apertures and having an opening therein in alignment with said apertures, a pin extending through said apertures and opening, and means carried by said pin for holding said members in a plurality of positions corresponding to the position of the spindle.

'JOHN Y. BLAZEK. VERNON R. ROY. 

